Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1992-04-30
1993-08-31
Berman, Susan
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 81, 522174, 522182, 522183, 525455, 4284259, 428694, 428900, C08F 250, C08F 7104, C08F29300, B32B 2700
Patent
active
052409724
ABSTRACT:
The present invention relates to an iniferter compound of the formula I(T).sub.n wherein I represents the free radical initiator portion of the iniferter compound and wherein I comprises a hydroxy-functional polyurethane polymer which comprises: (i) a polyurethane backbone; (ii) a plurality of cross-linkable hydroxy groups pendant from the polyurethane backbone, wherein the polyurethane backbone has a hydroxy equivalent weight of from about 500 to about 10,000; (iii) at least n organic groups X which can be the same or different pendant from the polyurethane backbone wherein each organic group X is also bonded to a T group; T represents the terminator portion of the iniferter; and n is an integer of at least 1; wherein T and X are organic groups selected so that the T--X bond is capable of dissociating upon being subjected to an appropriate energy source of forming a terminator free radical of the formula nT.multidot. and an initiator free radical of the formula I(.multidot.).sub.n . The invention also relates to an iniferter which further comprises at least one SO.sub.3 M group pendant from the polyurethane backbone, to vinyl/polyurethane copolymers made from the iniferters, to a method of making the copolymers, and to the use of the copolymers in magnetic recording media.
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Kumar Ramesh C.
Ohkubo Takatoshi
Berman Susan
Dowdall Janice L.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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